Lamp-globe.



15161845362; PATENTED MAR. 5, 1907. G. A. MAGBETH 6; H. A. SGHNELBAGH.

LAMP GLOBE.

APPLIOATIQN FILED AUG.23.1906.

. UNITED S ATES PATENT OFFICE.

, GEORGE A. MACBETH AND HENRY A. scnNELBAcH, or PITTSB RQPENN- SYLVANIA,ASSIGNORS T MACBETH-E LANS GLASS COMPANY, or PITTS- BURG, PENNSYLVANIA ACORPORATION or PENNSYLVANIA.

LAMP-GLOBE.

Specification of Letters Patent.

Patented. March 5, 1907.

- Annlicatioa filed August 23, 1906. Serial No, 331,759.

To (LU .wil-mnfl 1.11/03 (NH/1757'! Be it known that we, GEORGE A.MAoBETn and HENRY A. SoHNELnAon, citizens of the United States, residingat Pittsburgin the State of Pennsylvania, have jointly invented certainnew and useful Improvements in Lamp-Globes, of which the following is aspecification. Our nvention relates especially to the IQ protectiveglobes used upon inverted gaslamps and the like; and itsprimary objectsare to provide proper ventilation for the burner, while at the sametime'closing the bottom of the globe to prevent dirt or carbon and 5lragments of the mantle from dropping through it; to provide aneasily-removable closure for the bottom oi an open-mouthed globe withoutdestroydng the symmetry of the globe; to provide better distribution ofthe air for perfect combustion and to protect the mantle, and tootherwise improve the efficiency of lamp-glows.

in the accompanying drawing, Figure 1 is a central verticalsection of alamp-globe and Side elmaliou of the ventilatbig-valve applied therein.Fig. 2 is an under.planyvicw of this valve or ventilator, and Fig. 3 isa central vertical section of the same. Figs, 4 and 5 illustrate,respectively, in plan and in 5 section on the line 5 in big. 4; amodified form of the device. Fig. 6 shows another l'orm in which thevalve is a lens.

in the use of inverted gas-lights it is necessary, of courso,,to providein'the protectingglobe sullicient ventilation, and it is highly low andalso to have the air completely surround the (lame. (-llobcs with openbottoms have been found to be dangerous, because 4 pieces oi the mantlemay drop through and desirable to provide such ventilation frombeconstruction shown in the drawings, in which the lamp 7 is placedinside of a globe 8, which practically surrounds it, and is synnnetricalin outline. The globe is open at the bottom for ventilation and for easycleaning or inspection of the burner. The globe has no perforations; butthe opening is closed by a ventilating-valve 9, which may be of any formdesired, but preferably cup-shaped and completing the contour of theglobe, and it is made with a flange 10, holding it within the openinginthe globe. In Fig. 1 it is practically a hollow cone of glass in formthat may 6 5 easily be molded, and is provided with ribs 11, extendingalong the flange 10 and down the vertical sides 12, which register withthe opening in the globe, so that the valve may be self-centering andfit neatly in place and 7c yet allow ample open spaces 13 for ingress ofair. The flaring flange 10 of the valve 9 extends outward over theairpassages 13, so that no particles from the lamp or other trash candrop through the globe. This shape of the valve and the flange causes acurrent of air directed along the open surface of the globe andcompletely surrounding the flame by rliilused draft, thus protecting theglass and improving the oxidation and the even wear of the mantle.

in Figs. 4 and 5 iS shown a modified form, having a series of scallops,and these will of course be made to correspond with the de sign of theglobe. Usually the globe willbe made opaque on top and the valvetranspar out. In some cases, as in library-lamps; it may be desirable toconcentrate the light in a vertical direction, and in such case theglobe is made opaque on top and with shoulders 14 to reflect lightdownward, as shown in Fig. 6, I and the valve 15 is made in the form ofa lens, with projections 16 to space it from the open ing and hold it inthe globe. The globe by these means is made complete in contour, and the'95 bottom is closed against the falling out of any particles from theburner, and yet there is provided ample and well-distributed ventila-Ltion for the burner. The-valve may be readily taken out in order to insset the burner 'orto more efiiciently clean t e globe. Other advantageswill readily occur to those familiar with the art. 7

Having thus described our invention and having an opening in the bottom,or a combinedshield and ventilator comprising a cone with a flangeextending into the globe and its point extending through the opening,said shield being provided with inclined ribs adapted to engagethe globeand space the shield therefrom.

2. The, combination of a glass lamp-globe having a plain opening in itsbottom, a transparent shield and ventilating-disk placed in the openingto catch detritus from the lamp, said disk continuing the outline of theglobe and having a flaring upper end substantially parallel with thesurrace of the globe and having integral ribs thereon to space it fromthe globe, substantially sis-described.

3. The combination with a reflecting lampbottom opening of the globearound the circumrerence or" said lens,

globe having an open bottom, of atransparent lens-valve placed in and.covering the and having means for allowing ventilation, substantially asdescribed.

4. The combination with a lamp-globe having an opening in the bottom, ora lens adapted to hang through said opening, and provided'with means onthe lens to center and support it on but space it from the globe,whereby ventilating-openings are PIOVldtgd su stantially as described.

In testimony whereof we have hereunto signed our names in the presenceof the subscribed witnesses.

GEO. A. MACBETH. HENRY A. SCHNELBACH.

Witnesses:

DANIEL J. DWYER, F. W. H. CLAY.

